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Overheat / check engine light on

Tiny
CUSTOMC5757
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 130,000 MILES
My 2004 grand prix, 3.8 vin2 cooling fans work when I open the circuit, but will not come on when engaging ac or when the temp rises in normal operating scenario. Changed thermostat, temp sensor, relays and checked wiring form sensor to harness? Seems ok? But still not coming on
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Wednesday, August 10th, 2011 AT 6:02 PM

4 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
How hot will the car get in degrees?
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Wednesday, August 10th, 2011 AT 7:10 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Also, have the codes read and post them here.
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Wednesday, August 10th, 2011 AT 7:10 PM
Tiny
CUSTOMC5757
  • MEMBER
  • 2 POSTS
The temp gauge will rise to above 3/4 mark if I allow it too. The only code that has surfaced is PO118. Thanks
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Thursday, August 11th, 2011 AT 3:17 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I suspect you're getting the PO118 because you are unplugging the temp sensor with the key on. It might not be a bad idea to change it anyway if you don't have a scan tool to read the actual data live. We see this question often and most of the time there is actually no problem at all. The fans are not even programmed to come on until around 225degrees or higher intentionally. That's pretty high on the gauge but is normal.
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Thursday, August 11th, 2011 AT 9:54 AM

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